<tr>
    <td class="form-label"> X1
        < /td>
            <td>
                <input type="text" id="X1" data="X1" name="X1" class="form-control"> </td>
            <td class="form-label"> X2
                < /td>
                    <td>
                        <input type="text" id="X2" data="X2" name="X2" class="form-control"> </td>
</tr>